UK Tax Tools for Side Hustlers
Free, no-signup tax calculators for UK side hustlers and second income earners. Every figure is verified against HMRC and gov.uk sources for the current 2026/27 tax year, with citations on each tool.
Trading Allowance Calculator
Check if your side hustle income is above the £1,000 tax-free trading allowance, whether you need to register for Self Assessment, and whether claiming the allowance or your actual expenses leaves you better off.
Open calculator › Tax year 2026/27Side Hustle Tax Calculator
Work out exactly how much Income Tax and Class 4 National Insurance you owe on your side hustle. Handles dividends, Scottish tax bands, expenses, and the Personal Allowance taper for higher earners.
Open calculator › 7-question quizWhich Side Hustle Suits You?
Answer seven short questions about your time, budget, skills, and risk tolerance, and we will rank the UK side hustles best suited to you from our 22 reviewed options. No signup, no email needed.
Take the quiz › Free template · 2026/27Self Assessment Registration Checklist
A free 12-step checklist for UK sole traders registering with HMRC for the first time. Fill in the details as you go, they save automatically. Print, save as PDF, or share by link. All the gov.uk links inline.
Open checklist ›How accurate are these tools? Every figure used here comes directly from gov.uk, HMRC, gov.scot, or HM Treasury, and is cited on each tool's page. The underlying calculation logic is unit-tested against HMRC's own worked examples. That said, these are guides not personal tax advice. For your specific circumstances, consult HMRC or a qualified UK accountant.
When are these updated? Tax rates change at each Budget. We update these tools at the start of each new tax year (6 April) once HMRC publishes the new figures. The current versions reflect Autumn Budget 2025 (the most recent fiscal event) and all rates effective from 6 April 2026.